Unloading device for pump inlet-valves.



No. 849,916. PATENTBD APR. 9, 1907.

W. R. MQKEEN, JR. UNLOADING DEVICE FOR PUMP INLET VALVES.

APPLICATION FILED MAY 20, 1 905.

ammal for Pump 1 UNITED STATES,

PATENT OFFICE.

.WIILLIAM R. MQKEEN, JR.,"F OMAHA, NEBRASKA,

UNLOADING DEVICE To all whom it may concern:

, Be it'known that 1, WILLIAM R. MOKEEN, JR'., a citizen of the United States,residing at Omaha, in the county of DouglasandState of Nebraska, have invented certain new and useful Improvements in Unloading Devices nlet-Valves; and I do hereby de' clare the'following to be a full, clear, and ex actdescription of the invention, such as enable others skilled in the art to which it appertains to make and use the same.

This invention relates to pumps, and is particularly directed to valve mechanism for controlling the supply of fluid-pressure from a pump I One of its objects is to providevalve mechanism in a pump of such construction as to be placed in inoperative condition when the fluid pressure in an inclosing chamber reaches a certain limit. v

I Another object is to provide a pump such that when the fluid-pressure in an inclosing chamber or tank supplied thereby reaches a certain limit the flow-offluid into said in closing chamber or tankmay be arrested Without interfering in any way with the operation of the l mp-piston.

, A further 0 ject is to provide a continu I ously-driven pump of such construction as to beplaced in an inoperative condition when the fluid-pressure in the inclosing chamber reaches a certain prescribed amount.

Other objects will be in part obvious and in part pointed out hereina ter.

The inventionaccordingly consists in the features of construction, combinations of ele' ments', and

arrangement of parts which will be exempl' ed in the mechanism hereinafter described nd the scope of the application of which will be indicated in the following claims.

In the accompa 'ng drawings, wherein is illustrated one of the various possible embodiments of my invention, Figure 1 is a vertical central sectional view showing the valve mechanism. Fig. 2 isan elevation of the same. Fig. 3 is a plan view thereof.

" Similar reference characters refer to simi-.

lar parts throughout the several views of the drawings.

I employ in combinationcwith any ordinarly'reciprocating pump 1 a valve 2, contro ing the intake of air to said pump, said valve bein provided with a stem 3, having a head 4. spring 5 is interposed between the head 4 and the casing 6, constituting a Specification of Letters Patent. Application filed'lllay 20,1905. Serial No. 261,387.

= ing 7.. A vertical'rod FOB PUMP INLET-VALVES.

Patented April 9, 1907.

seat for the valve 2, said spring normally retaining. said valve upon its seat, but being sufficiently weak to permit the valve to lift from its seat and admit air under the drawing action of the receding stroke of the pump-piston. .The valve-casing 6 is preferably surrounded by any suitable housing 7, provided with a ertures 8, covered by any preferred form 0 screening 9, designed to prevent the admission of foreign substances. Any ordinary check-valve 10 may be arranged for con-' trolling the discharge'of air through any form t of discharge-pipe11. A plate 12 is mounted on any suitable supports 13 above the hous in its under surface, de

with respect to the cams 18 or 14 extends through rod, such mounting of the bolt 17 being designed to permit rotation of the cams 18.

handle 19 isbifurcated, as at20, and fixed to or formed integral with-the cams '18 and is designed to ,be operated manually for swinging the cams to the opposite extremes of' their movement.

Having thus described my invention, its operation, which should be largely obvious,

is substantially as follows: When'it' is desired to permit the pump 1 to operate and to supply pressure to the pipe 11, the parts are ositioned, asindicated in dotted lines in ig. 1, with the bolt 17 at its uppermost position and the rod 14 and weight 15, sustained thereby, in an elevated condition, so that the stein 3 is free to be acted uponby the spring 5. When it is desired to throw the pump out of operative condition, it is only necessary to swing the handle 18 to the position indicated in Fig. 1 in full lines, whereby the bolt 17 is lowered and the rod 14 and weight 15 permit ted to move downwardly, which movement eflects a com ression of the spring 5 by the weight 15 an an opened position. While in this condition the reciprocation of the pump-piston will effect an intake and discharge through the opening for the valve 2 and will not supply pressure to the pipe '11.? It will accordingly .cau'ses the valve 2 to-assume be seen that I have provided mechanism characterized by simplicity and efliciency, the several parts cooperating to achieve the advantageous results whereby the flow of the fluid to the storage-tank may be stopped at will without interfering in any way With the operation of the pump-piston.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a pump-valve mechanism, the combination with an ntake-valve of a pump, a

spring normally pressing the said valve to its seat, and a weight suspended above the valve and adapted to be lowered into engagement with the stem thereof for overcoming the' pressure of the spring.

2. In a valve mechanism, the combination with the intake-valve ofa pump, a spring engaging. the stem of said valv e for normally maintaining the Valve closed, .a weight suspended above said valve and adapted to be lowered into engagement with the stem for overcoming the pressure of the spring, the said weight being adapted to interlock with the free end of the stem when engaging the same. 1

3. In a valve mechanism, the combination of the intake-valve of a pump, a spring engaging the stem of the same for normally maintaining the valve closed, a cam mounted above the valve-stem, a weight supported by said cam and adapted to be lowered into engagement with the valve-stem for overcoming the pressure of the spring, and means for supporting said cam in osition for permitting free bodily upward movement of the cam. I

4. In a valve mechanism, the combination of an intake-valve of a pump, a spring engaging the stem thereof, and normally maintaining the valve in a closed position, a weight sus ended above said stem, a cam supporting said weight, a handle projecting from said cam in position for being operated for raising or lowering the weight, the handle being so positioned as to lie substantially flat in-one of the extremes of movement of the cam, and a support for the cam ermitting the cam to move freely upwardly but retaining the same against downward movement. 1

In testimony whereof I affix in presence of two witnesses.

' WILLIAM R. MGKEEN, JR.

my signature I 

